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F. TRINKS.

CALCULATING MACHlNE..

I APPLICATION FILED JAILZB, 19l9- I 1,390,18 PatentedSept. 6, 1921.

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FRANZ THINKS, 0F BRUNSWICK, GERMANY.

CALCULATINGMAOHINE.

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Specification of Letters Patent.

Patented Sept. e, 1921.

Application filed January 28, 1919. Serial No. 273,694.

T 0 all whom 2'15 may concern Be it known that I, FRANZ TRINKs, manufacturer, citizen of the Republic of Germany, residing at Brunswick, Germany, have invented certain new and useful Improvements in Calculating-Machines, (for which I have filed applications in Germany, January 18, 1918; Austria, December 11, 1918; Hungary, December 12, 1918; Switzerland, December 11, 1918, and England August 27, 1919,) of which the following is a specification.

My present invention relates to calculating machines in general, and has for its object to provide improvements whereby the utilization of such machines for doing mathematical operations quickly and conveniently is greatly facilitated. My invention consists in the provision of a plurality of tablets compiled in form of a book and so secured on the exterior ofthe machine casing that the tablets may be handled like the pages of a book. Upon these tablets may be written or printed any often required dates, formulze, notes or the like, to be ready for the inspection of the operator, whenever required by the same during the course of a calculation. The thus provided device means a great facility for, and is a time-saver to the operator of a calculating machine.

In order to render my invention quite clear I have illustrated an embodiment of the same, by way of example, in the accompanying drawing which forms a part of this application.

Figure 1 is a front elevation,

Fig. 2 is a side elevation, and

Fig. 3 is a plan view of a calculating machine.

Figs. 4:, 5 6, 7 and 8 are detail views of the novel device and showing modifications of constructions.

In the drawing the calculating machine casing is designated a. At a suitable and convenient position upon the exterior of the casing a I place a plurality of superposed tablets a which may consist of any suitable material, such as, sheet metal, hard rubber, wood, or the like and are joined in a booklike manner by means of hinges b or any other equivalent means provided at the rear end of the tablets. The blank spaces of these tablets are to receive the dates, formulae, or the like, which may be directly written or printed upon the tablets, or may be written or printed upon sheets of paper which. may be fastened on said tablets by means of paste or the like. utilize both faces of each tablet, I propose to provide a stay or support 0 (see Fig. 4) adapted to 'hold each tablet, when being turned upward in a desklike position whereby the lower face of each tablet is displayed to the operator sitting in front of the machine; the dates and formulae written upon the upper face of each tablet may be inspected when the tablet is resting flat upon the wall of the casing.

In Fig. 5 I have indicated means whereby the operator is enabled to reverse the booklike compilation of tablets as a whole so that the upper tablet faces may be inspected in one position, while for the inspection of the lower tablet faces, the whole device is being turned whereafter the lower tablet faces are displayed as upper tablet faces. Such means may consist of an additional bar (Z, combined with the hinge-like device Z) holding the tablets together. This bar (Z is of dove tailed shape and adapted to engage a correspondingly formed groove in another bar fixed upon the machine casing 2. By a longitudinal movement of the bar cl the same can be detached from the bar d and replaced by a similar movement after the book of tablets a has been reversed. The detachable hinge Z), d may be used in combination with the support 0 shown in Fig. 4:. Another embodiment of the same idea is shown in Fig. 6, wherein the hinge Z2 is provided with a resilient clamping device 0 detachably holding each tablet a which, hence, may be reversed, individually.

When it is desired to provide for a washable writing face this may be done by making the uppermost tablet of a suitable material, or covering the tablet with such a material. In the embodiment of my invention shown in Fig. 7 I have provided a special plate 7" for the same purpose. Ihis writing plate 7 covers the tablets a and may be turned about its hinge g which, preferably, is disposed at an angle of about 90 with regard to the position of the hinge for the tablets a. In Fig. 7 the hinge for the tablets a is for that reason not visible. In-

stead of providing one common revolving To be able to conveniently axis for all of the tablets, I may provide a revolving axis for each tablet and give them off-set positions as shown, for instance, in Fig. 8. To hold the uppermost tablet in a convenient reading position a stop it may be provided. For the other tablets the revolving pin of each preceding tablet acts as a stop in the same manner when the revolving pins 2' are arranged in a step-like manner as shown in Fig.

What I claim as my invention and desire to secure by Letters Patent in the United.

States, is

1. In a device for use in combination with calculating machines and the like, a device for displaying dates and formulae and consisting of a plurality of tablets compiled in the form of a book, the writing faces of one of said tablets consisting of a washable material, adapted to be wrltten on.

2. In a device for use in combination with calculating machines and the like, a device for displayin dates and formulae and consisting of a plurality of tablets compiled in the form of a book, the writing faces of one of said tablets consisting of a washable material, adapted to be written on, and means for holding said plurality of tablets so that each tablet may be turned like a page of a book. a

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

FRANZ TRINKS.

Witnesses:

WILHELM LEHRKE, GERTRUD HEMPEL. 

